John Whitehouse
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Everything posted by John Whitehouse
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Thanks for interest already shown and I’m glad to report the problem was CHRONIC collimating which was established by purchasing ‘Bobs Knobs’ . The enclosed leaflet suggested an initial visual check through the front from a distance of 5-10 metres and it then became very obvious. I then took the decision to remove the secondary lens and the mis-alignment was very evident. I then used a micrometer and levelled it to +/- 0.02mm. Eureka
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This is a screenshot I took of the image which is Betelgeuse and I would be interested in any views as to what has caused this distortion.
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Will do next week Michael and thanks for your interest.
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Thanks for your opinions but unfortunately I took this image of Sirius on an old IPad and duplicated it by photographing it off the screen. When eventually the clouds disappear, I shall submit an accurate reproduction. Many thanks for your interest and time.
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I seem to have developed a problem which I don’t understand which is becoming more regular as I approach my 79 th. birthday and I attach a recent image of Sirius as an example. My equipment: Celestron 14” Edge HD, 0.7 Reducer, Off Axis Guider, CGX mount, ASIR AIR Plus, ZWO ASI071MC Pro any suggestion would be appreciated.
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Although I joined in 2014, I've been too busy running a business to get too involved and now with the COVID-19 crisis, have finally dusted off my 14" Celestron Edge HD six weeks ago only then to have a catastrophe when a Northern Gale blew the dome off the top of my Pulsar Observatory!
During that night rain got into the RA drive and completely ruined the electronics and after struggling to find support from the original supply chain, decided to upgrade the mount to a CGX-L which in itself created problems in that the mount is 200mm lower than it's predecessor.
Not only that, the bolt positions for the new mount needed re-drilling to get a better Polar Alignment.
Unfortunately, during this major re-build and because of the significant weight of the components, on one occasion struggled with the tube, which had a considerable bump onto a rubber floor.
I now have a problem as during the process of aligning the finder scope with the main Tube, I find that although both focusing well at short distances, I cannot get the main Scope to focus on a star.
Could this be a collimation problem or even worse a main mirror mis-alignment?
